TM 55-1510-222-10moisture absorption of rope or thermal contraction ofcable or chain. Do not use slip knots. Use bowlineknots to secure aircraft to mooring stakes.(2)Chock the wheels.b.Mooring Procedures for High Winds.Structural damage can occur from high velocity winds;therefore, if at all possible, the aircraft should be movedto a safe weather area when winds above 75 knots areexpected. Moored aircraft condition is shown in figure2-36. If aircraft must be secured, use the followingsteps:1.After aircraft is properly located, placenose wheel in centered position. Point the aircraft intothe wind, or as nearly so as is possible within limitsdetermined by locations of fixed mooring rings. Whennecessary, a 45 degree variation of direction isconsidered to be satisfactory. Locate each aircraft atslightly more than one wing span distance from all otheraircraft. Position nose mooring point approximately 3 to5 feet downwind from ground mooring anchors.2.Deflate nose wheel shock strut to within3/4 inch of its fully deflated position.3.Fill all fuel tanks to capacity, if timepermits.4.Place wheel chocks fore and aft of maingear wheels and nose wheel. Tie each pair of chockstogether with rope or join together with wooden cleatsnailed to chocks on either side of wheels. Tie ice gripchocks together with rope. Use sandbags in lieu ofchocks when aircraft is moored on steel mats. Setparking brake as applicable.5.Tie aircraft down by utilizing mooringpoints shown in figure 2-36. Make tiedown with 1/4 inchaircraft cable using two wire rope clips, or bolts and achain tested for a 3000 pound pull. Attach tiedowns soas to remove all slack. Use a 3/4-inch or larger manilarope if cable or chain tiedown is not available. If rope isused for tiedown, use anti-slip knots (such as bowlineknot) rather than slip knots. In the event tiedown ringsare not available on hard surfaced areas, move aircraftto an area where portable tiedowns can be used. Locateanchor rods at point shown in figure 2-36. When anchorkits are not available, use metal stakes or deadman typeanchors, providing they can successfully sustain aminimum pull of 3000 pounds.6.In event nose position tiedown isconsidered to be of doubtful security due to existing soilcondition, drive additional anchor rods at nose tiedownposition. Place padded work stand or other suitablesupport under the aft fuselage tiedown position andsecure.7.Place control surfaces in locked positionand trim tab controls in neutral position. Place wingflaps in up position.8.The requirements for dust excluders,protective covers, and taping of openings will be left tothe discretion of the responsible maintenance officer orthe pilot of the transient aircraft (fig. 2-34).9.Secure propellers to prevent windmilling(fig. 2-34).10.Disconnect battery.11.During typhoon or hurricane windconditions, mooring, security can be further increasedby placing sandbags along the wings to break up theaerodynamic flow of air over the wing, thereby reducingthe lift being applied against the mooring by the wind.The storm appears to pass two times, each time with adifferent wind direction. This will necessitate turning theaircraft after the first passing.12.After high winds, inspect aircraft forvisible signs of structural damage and for evidence ofdamage from flying objects. Service nose shock strutand reconnect battery.2-94